I ran into similar problem on an IPad 3 and was able to fix it. My problem was with the LCD, not the digitizer. The black retaining clip was broken off.
I used a thin plastic piece, cut to the size of the ribbon cable and push it in, on top of the ribbon cable to thicken it. Instead of the mylar tape, I re-used the screen protector from an old Nintendo DS and cut it to size. I did not think it would work but it did for me after 4,5 tries. I believe any screen protector would do, if you do not have the mylar tape around.
Good luck.